Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62543cd60167e5f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 20:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24630e5c379de8c6b098f5e3419b4f5e SHA-1: 1510815316e3889676d61cd224010a7e8b3d3b9b SHA-256: e62543cd60167e5f6f8f003e0a253d18160f2484dd8c2febe8029883f202b469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cbconsulting112.ca/userfiles/files/72831284423.pdf In PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/vanowilomilopodozolo.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/59857823483.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/64092236620.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145882c8c8d1---43362793829.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/deraw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/29ad73060efa50a789844a51a30884bc/sumesifug.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/79620275086.pdfIn PDF document text
    • http://neteyes.eu/editor_up/mevisujujifuninif.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/nitoxolesemepiw.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/nutobovupumit.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/82990117866.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/87262332079.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/galonazunawezuburadumofu.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/1501161521.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/gaxutexej.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161353e9b4c25b---43094906820.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/79363953116.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/57167508117.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5cf26ed5b7e75aee630608c2ab04fe70/bazekanigabemasonagimib.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xisigikifapafakarid.pdfIn PDF document text
    • http://gysanya.com/upload/file/210916215031247731ebdcmaubwu4p.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/gekuwezomidukusolika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+super+mechs+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 17228 bytes
SHA-256: c76ffc57be356ef7b23218f4c4bb53ffee21f4a353cefe784c0c94fd2f73ff20
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 10868 bytes
SHA-256: c03a2f8dc29ec69817541af1568abb2bd411bff3d269d11db6d1334fa8944dda
font_02_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1